Scientists don’t know exactly why exercise changes the structure and function of the brain, but it’s an area of active research. So far, they’ve found that exercise improves blood flow to the brain, feeding the growth of new blood vessels and even new brain cells, thanks to the protein BDNF (brain-derived neurotrophic factor). BDNF triggers the growth of new neurons and helps repair and protect brain cells from degeneration. It may also help people focus, according to recent research.
The answer, then, is a short workout, right? Something that takes, say, 20 minutes tops. You’ll usually be able to squeeze that in between punching out at work and getting ready for your evening activities. But here’s the rub: It may only take you 20 minutes to train, but it takes 10-15 minutes (at least) to drive to the gym, five minutes or so to get in and out of the locker room, then 10-15 minutes to drive back home. You’re talking at least 45 minutes for the whole deal, but probably more like an hour-plus.
It boosts immunity. Regular exercise can reduce your risk of certain serious health conditions, including heart disease, diabetes and some cancers. It can also decrease your chances of developing -- and getting stuck with -- more common illnesses, such as flus and colds. (According to one recent study, colds lasted 43 percent longer for people who exercised once a week or less.)

Well, good (bad?) news: People who have dedicated their professional lives to defying Newton's First Law (you know them as "personal trainers") don't often have the luxury of skipping a sweat session. Next time you find yourself in need of a workout but without any of the things you think you need to get one, we got them to share the best workouts and circuits and exercises you can do anyway—no gear required.

Another way lunges differ from traditional squats is that they train each leg individually. This is known as unilateral training. Rather than solely improving your strength, unilateral exercises increase your balance and coordination. This brings your core and back strength into play. Focusing on one leg at a time with lunges can even help with symmetry and muscular imbalances.
Though some people actually love physical activity and look forward to it, for many of us, exercising is a mighty drag. Exercise has also had an added PR problem in recent years: A growing body of evidence has shown that it’s not all that good for weight loss, which was probably many people’s reason for doing it in the first place. It may help with weight a little, especially for maintenance, but by and large, if you want to drop pounds, the most effective way is to eat less, not necessarily to exercise more. That said, research in recent years has also illustrated quite persuasively what exercise is good for—and it is actually good for a number of things, including some very profound things, like reducing dementia risk. Here’s what science tells us we should probably keep exercising for, even though we may not love every minute of it.
Exercise has long been linked to better sleep, according to a review article published in December 2014 in the American Journal of Lifestyle Medicine. Other research suggests exercise may improve sleep and mood in people with insomnia, too, according to a study published in October 2015 in the Journal of Sleep Research. Conversely, poor quality sleep has been linked to a wide array of health problems, including cardiovascular disease, diabetes, and depression. Given the fact that getting adequate sleep is so crucial for good health, and that exercise is a low-cost, easily accessible solution that offers lots of other health benefits with no risk or side effects, giving exercise a try to improve sleep is a no-brainer.
Endorphins are hormones in the brain associated with a happy, positive feeling. A low level of endorphins is associated with depression. During exercise, plasma levels of this substance increase. This may help to ease symptoms of depression. A recent National Health and Nutrition survey found that physically active people were half as likely to be depressed.
When it comes to these pushups, make sure your left and right hands are shoulder-width apart to keep proper form. Keep your left elbow and right elbow in as well so you can activate not only your triceps but also your chest. This exercise is great because it helps you protect your rotator cuff, which is upon your shoulders. Shoot for 15 to 20 reps in this 30-second set. Don't go for high speed, go for perfect form.